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BACKUP, Qualifiers, /IO_LOAD
 *Conan The Librarian 

       /IO_LOAD[=n]

    Beginning in OpenVMS Version 8.3, BACKUP is optimized to work
    more efficiently with new storage controllers. You can use
    the /IO_LOAD qualifier to increase or decrease the number of
    simultaneous I/Os issued by the BACKUP utility. The default is 8
    I/Os. The minimum is 2 I/Os.

    If the /IO_LOAD qualifier is omitted from the command line, the
    default number of outstanding I/Os is still 8.
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